Custom nRF52833 board only succeeds to BLE advertise when it is maintaining a J-Link connection

RE: Custom nRF52833 board only succeeds to BLE advertise when it is maintaining a J-Link connection

edior — Fri, 12 Apr 2024 12:42:03 GMT

Hi Simon,

I have custom board of nrf52833, there is no radio (has 32khz, 32Mhz ok). i refered to this thread. which DCDC you refer in this thread ?

Thanks,

Eyall

RE: Custom nRF52833 board only succeeds to BLE advertise when it is maintaining a J-Link connection

Josh@PCDworks — Wed, 07 Oct 2020 13:50:37 GMT

Simon,

The DCDC regulator being enabled in the project seemed to fix the issue! Thank you so much for the help!

-Josh

RE: Custom nRF52833 board only succeeds to BLE advertise when it is maintaining a J-Link connection

Simonr — Wed, 07 Oct 2020 07:56:52 GMT

Hi again Josh

After a quick schematic review, I'm glad to say that this doesn't seem like a HW issue, as the schematics look good. You're saying that you only see this issue in nRF52833 boards, when opening the NCS project, what board directory are you using? Please make sure that this is set to nRF52833. Also, I see that the DCDC regulator is not used in your HW design, so please make sure that you disable this in the Board Options as well.

Best regards,

Simon

RE: Custom nRF52833 board only succeeds to BLE advertise when it is maintaining a J-Link connection

Josh@PCDworks — Tue, 06 Oct 2020 14:42:21 GMT

Simon,

There is a LF clock on the board. We made a little headway with this exact fix yesterday by setting the clock source to the external 32kHz oscillator. Now, instead of only advertising in a debug session and/or when the j-link is connected, the device can advertise with just a 'build and run' in SES.

The problem still remains in another form however. The advertising doesn't last a power cycle on the unit. We've been running through and testing all the different configurations for the 32kHz clock accuracy options to see if one allows the unit to survive a PC, but so far now luck.

Any ideas on this??

I went ahead and included the schematic of our board just in case it might be useful. devzone.nordicsemi.com/.../ASY_2D00_191002_2D00_5103_2D00_A_2D00_WASP_2D00_Environmental_2D00_Sense.pdf

Thanks,

Josh

RE: Custom nRF52833 board only succeeds to BLE advertise when it is maintaining a J-Link connection

Simonr — Tue, 06 Oct 2020 08:16:14 GMT

Is there an LF clock in your custom design? If not, the reason could be that you've not configured the project to run on the internal RC oscillator instead of the external crystal oscillator. Please try setting the RC oscillator as the 32kHz clock source in your NCS project. In SES you can do so by configuring the nRF Connect SDK Project, or alternatively change the CLOCK_CONTROL_NRF_SOURCE directly.

Best regards,

Simon